Extreme points of the closed unit ball in C*-algebras

Tom 74 / 1997

Rainer Berntzen Colloquium Mathematicum 74 (1997), 99-100 DOI: 10.4064/cm-74-1-99-100

Streszczenie

In this short note we give a short and elementary proof of a characterization of those extreme points of the closed unit ball in C*-algebras which are unitary. The result was originally proved by G. K. Pedersen using some methods from the theory of approximation by invertible elements.

Autorzy

  • Rainer Berntzen

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